Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems
Author Posting. © Ecological Society of America, 2005. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 15 (2005): 1462–1470, doi:10.1890/03-5354. Leaf area index (LAI)...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4710 2023-05-15T12:59:53+02:00 Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems van Wijk, Mark T. Williams, Mathew 2005-08 application/pdf https://hdl.handle.net/1912/4710 en_US eng Ecological Society of America https://doi.org/10.1890/03-5354 Ecological Applications 15 (2005): 1462–1470 https://hdl.handle.net/1912/4710 doi:10.1890/03-5354 Ecological Applications 15 (2005): 1462–1470 doi:10.1890/03-5354 Arctic tundra LAI Leaf area index Low-stature vegetation Normalized difference vegetation index Optical instruments Sweden Uncertainty analysis Article 2005 ftwhoas https://doi.org/10.1890/03-5354 2022-05-28T22:58:25Z Author Posting. © Ecological Society of America, 2005. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 15 (2005): 1462–1470, doi:10.1890/03-5354. Leaf area index (LAI) is a powerful diagnostic of plant productivity. Despite the fact that many methods have been developed to quantify LAI, both directly and indirectly, leaf area index remains difficult to quantify accurately, owing to large spatial and temporal variability. The gap-fraction technique is widely used to estimate the LAI indirectly. However, for low-stature vegetation, the gap-fraction sensor either cannot get totally underneath the plant canopy, thereby missing part of the leaf area present, or is too close to the individual leaves of the canopy, which leads to a large distortion of the LAI estimate. We set out to develop a methodology for easy and accurate nondestructive assessment of the variability of LAI in low-stature vegetation. We developed and tested the methodology in an arctic landscape close to Abisko, Sweden. The LAI of arctic vegetation could be estimated accurately and rapidly by combining field measurements of canopy reflectance (NDVI) and light penetration through the canopy (gap-fraction analysis using a LI-COR LAI-2000). By combining the two methodologies, the limitations of each could be circumvented, and a significantly increased accuracy of the LAI estimates was obtained. The combination of an NDVI sensor for sparser vegetation and a LAI-2000 for denser vegetation could explain 81% of the variance of LAI measured by destructive harvest. We used the method to quantify the spatial variability and the associated uncertainty of leaf area index in a small catchment area. This research was funded by U.S. National Science Foundation grant DEB0087046. Article in Journal/Newspaper Abisko Arctic Tundra Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Abisko ENVELOPE(18.829,18.829,68.349,68.349) Arctic Ecological Applications 15 4 1462 1470 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Arctic tundra LAI Leaf area index Low-stature vegetation Normalized difference vegetation index Optical instruments Sweden Uncertainty analysis |
spellingShingle |
Arctic tundra LAI Leaf area index Low-stature vegetation Normalized difference vegetation index Optical instruments Sweden Uncertainty analysis van Wijk, Mark T. Williams, Mathew Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems |
topic_facet |
Arctic tundra LAI Leaf area index Low-stature vegetation Normalized difference vegetation index Optical instruments Sweden Uncertainty analysis |
description |
Author Posting. © Ecological Society of America, 2005. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 15 (2005): 1462–1470, doi:10.1890/03-5354. Leaf area index (LAI) is a powerful diagnostic of plant productivity. Despite the fact that many methods have been developed to quantify LAI, both directly and indirectly, leaf area index remains difficult to quantify accurately, owing to large spatial and temporal variability. The gap-fraction technique is widely used to estimate the LAI indirectly. However, for low-stature vegetation, the gap-fraction sensor either cannot get totally underneath the plant canopy, thereby missing part of the leaf area present, or is too close to the individual leaves of the canopy, which leads to a large distortion of the LAI estimate. We set out to develop a methodology for easy and accurate nondestructive assessment of the variability of LAI in low-stature vegetation. We developed and tested the methodology in an arctic landscape close to Abisko, Sweden. The LAI of arctic vegetation could be estimated accurately and rapidly by combining field measurements of canopy reflectance (NDVI) and light penetration through the canopy (gap-fraction analysis using a LI-COR LAI-2000). By combining the two methodologies, the limitations of each could be circumvented, and a significantly increased accuracy of the LAI estimates was obtained. The combination of an NDVI sensor for sparser vegetation and a LAI-2000 for denser vegetation could explain 81% of the variance of LAI measured by destructive harvest. We used the method to quantify the spatial variability and the associated uncertainty of leaf area index in a small catchment area. This research was funded by U.S. National Science Foundation grant DEB0087046. |
format |
Article in Journal/Newspaper |
author |
van Wijk, Mark T. Williams, Mathew |
author_facet |
van Wijk, Mark T. Williams, Mathew |
author_sort |
van Wijk, Mark T. |
title |
Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems |
title_short |
Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems |
title_full |
Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems |
title_fullStr |
Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems |
title_full_unstemmed |
Optical instruments for measuring leaf area index in low vegetation : application in Arctic ecosystems |
title_sort |
optical instruments for measuring leaf area index in low vegetation : application in arctic ecosystems |
publisher |
Ecological Society of America |
publishDate |
2005 |
url |
https://hdl.handle.net/1912/4710 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) |
geographic |
Abisko Arctic |
geographic_facet |
Abisko Arctic |
genre |
Abisko Arctic Tundra |
genre_facet |
Abisko Arctic Tundra |
op_source |
Ecological Applications 15 (2005): 1462–1470 doi:10.1890/03-5354 |
op_relation |
https://doi.org/10.1890/03-5354 Ecological Applications 15 (2005): 1462–1470 https://hdl.handle.net/1912/4710 doi:10.1890/03-5354 |
op_doi |
https://doi.org/10.1890/03-5354 |
container_title |
Ecological Applications |
container_volume |
15 |
container_issue |
4 |
container_start_page |
1462 |
op_container_end_page |
1470 |
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1766125027433906176 |